/*******************************************************************************
 * Copyright (c) 2005, 2014 springside.github.io
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 *******************************************************************************/
package cn.dakaqi.utils;

import java.security.SecureRandom;
import java.util.UUID;

/**
 * 封装各种生成唯一性ID算法的工具类.
 *
 * @author calvin
 */
public class Identities
{

    private static SecureRandom random = new SecureRandom();

    /**
     * 封装JDK自带的UUID, 通过Random数字生成, 中间有-分割.
     */
    public static String uuid()
    {
        return UUID.randomUUID().toString();
    }

    /**
     * 封装JDK自带的UUID, 通过Random数字生成, 中间无-分割.
     */
    public static String uuid2()
    {
        return UUID.randomUUID().toString().replaceAll("-", "");
    }

    /**
     * 使用SecureRandom随机生成Long.
     */
    public static long randomLong()
    {
        return Math.abs(random.nextLong());
    }

    public static int randomInt(int bound)
    {
        return Math.abs(random.nextInt(bound));

    }
    /**
     * 基于Base62编码的SecureRandom随机生成bytes.
     */
    public static String randomBase62(int length)
    {
        byte[] randomBytes = new byte[length];
        random.nextBytes(randomBytes);
        return org.springside.modules.utils.Encodes.encodeBase62(randomBytes);
    }

    public static void main(String[] args)
    {
//        for(int i=0;i<=10;i++)
//        {
//            System.out.println(randomBase62(20).toUpperCase());
//            System.out.println(randomInt(999999999));
//        }
//
//        System.out.println(uuid().toUpperCase());
//        System.out.println(uuid2().toUpperCase());
//        System.out.println(randomLong());

        System.out.println(randomBase62(32));
    }
}
